/*
  MIT License http://www.opensource.org/licenses/mit-license.php
  Author Tobias Koppers @sokra
*/
"use strict";

const Template = require("webpack/lib/Template");

class JsonpMainTemplatePlugin {

  apply(mainTemplate) {
    mainTemplate.plugin("local-vars", function(source, chunk) {
      if(chunk.chunks.length > 0) {
        return this.asString([
          source,
          "",
          "// objects to store loaded and loading chunks",
          "var installedChunks = {",
          this.indent(
            chunk.ids.map(id => `${JSON.stringify(id)}: 0`).join(",\n")
          ),
          "};"
        ]);
      }
      return source;
    });
    mainTemplate.plugin("jsonp-script", function(_, chunk, hash) {
      const chunkFilename = this.outputOptions.chunkFilename;
      const chunkMaps = chunk.getChunkMaps();
      const crossOriginLoading = this.outputOptions.crossOriginLoading;
      const chunkLoadTimeout = this.outputOptions.chunkLoadTimeout;
      const scriptSrcPath = this.applyPluginsWaterfall("asset-path", JSON.stringify(chunkFilename), {
        hash: `" + ${this.renderCurrentHashCode(hash)} + "`,
        hashWithLength: length => `" + ${this.renderCurrentHashCode(hash, length)} + "`,
        chunk: {
          id: "\" + chunkId + \"",
          hash: `" + ${JSON.stringify(chunkMaps.hash)}[chunkId] + "`,
          hashWithLength(length) {
            const shortChunkHashMap = Object.create(null);
            Object.keys(chunkMaps.hash).forEach(chunkId => {
              if(typeof chunkMaps.hash[chunkId] === "string")
                shortChunkHashMap[chunkId] = chunkMaps.hash[chunkId].substr(0, length);
            });
            return `" + ${JSON.stringify(shortChunkHashMap)}[chunkId] + "`;
          },
          name: `" + (${JSON.stringify(chunkMaps.name)}[chunkId]||chunkId) + "`
        }
      });
      return this.asString([
        "var script = document.createElement('script');",
        "script.type = 'text/javascript';",
        "script.charset = 'utf-8';",
        "script.async = true;",
        `script.timeout = ${chunkLoadTimeout};`,
        crossOriginLoading ? `script.crossOrigin = ${JSON.stringify(crossOriginLoading)};` : "",
        `if (${this.requireFn}.nc) {`,
        this.indent(`script.setAttribute("nonce", ${this.requireFn}.nc);`),
        "}",
        `script.src = ${this.requireFn}.p + ${scriptSrcPath};`,
        `var timeout = setTimeout(onScriptComplete, ${chunkLoadTimeout});`,
        "script.onerror = script.onload = onScriptComplete;",
        "function onScriptComplete() {",
        this.indent([
          "// avoid mem leaks in IE.",
          "script.onerror = script.onload = null;",
          "clearTimeout(timeout);",
          "var chunk = installedChunks[chunkId];",
          "if(chunk !== 0) {",
          this.indent([
            "if(chunk) {",
            this.indent("chunk[1](new Error('Loading chunk ' + chunkId + ' failed.'));"),
            "}",
            "installedChunks[chunkId] = undefined;"
          ]),
          "}"
        ]),
        "};",
      ]);
    });
    mainTemplate.plugin("require-ensure", function(_, chunk, hash) {
      return this.asString([
        "var installedChunkData = installedChunks[chunkId];",
        "if(installedChunkData === 0) {",
        this.indent([
          "return new Promise(function(resolve) { resolve(); });"
        ]),
        "}",
        "",
        "// a Promise means \"currently loading\".",
        "if(installedChunkData) {",
        this.indent([
          "return installedChunkData[2];"
        ]),
        "}",
        "",
        "// setup Promise in chunk cache",
        "var promise = new Promise(function(resolve, reject) {",
        this.indent([
          "installedChunkData = installedChunks[chunkId] = [resolve, reject];"
        ]),
        "});",
        "installedChunkData[2] = promise;",
        "",
        "// start chunk loading",
        "var head = document.getElementsByTagName('head')[0];",
        this.applyPluginsWaterfall("jsonp-script", "", chunk, hash),
        "head.appendChild(script);",
        "",
        "return promise;"
      ]);
    });
    mainTemplate.plugin("require-extensions", function(source, chunk) {
      if(chunk.chunks.length === 0) return source;

      return this.asString([
        source,
        "",
        "// on error function for async loading",
        `${this.requireFn}.oe = function(err) { console.error(err); throw err; };`
      ]);
    });
    mainTemplate.plugin("bootstrap", function(source, chunk, hash) {
      if(chunk.chunks.length > 0) {
        var jsonpFunction = this.outputOptions.jsonpFunction;
        return this.asString([
          source,
          "",
          "// install a JSONP callback for chunk loading",
          `var parentJsonpFunction = global[${JSON.stringify(jsonpFunction)}];`,
          "if (parentJsonpFunction) {",
          this.indent([
            "if (parentJsonpFunction.isMpvueLoaderInit) return;",
            "parentJsonpFunction.isMpvueLoaderInit = true;",
          ]),
          "}",
          `global[${JSON.stringify(jsonpFunction)}] = function webpackJsonpCallback(chunkIds, moreModules, executeModules) {`,
          this.indent([
            "// add \"moreModules\" to the modules object,",
            "// then flag all \"chunkIds\" as loaded and fire callback",
            "var moduleId, chunkId, i = 0, resolves = [], result;",
            "for(;i < chunkIds.length; i++) {",
            this.indent([
              "chunkId = chunkIds[i];",
              "if(installedChunks[chunkId]) {",
              this.indent("resolves.push(installedChunks[chunkId][0]);"),
              "}",
              "installedChunks[chunkId] = 0;"
            ]),
            "}",
            "for(moduleId in moreModules) {",
            this.indent([
              "if(Object.prototype.hasOwnProperty.call(moreModules, moduleId)) {",
              this.indent(this.renderAddModule(hash, chunk, "moduleId", "moreModules[moduleId]")),
              "}"
            ]),
            "}",
            "if(parentJsonpFunction) parentJsonpFunction(chunkIds, moreModules, executeModules);",
            "while(resolves.length) {",
            this.indent("resolves.shift()();"),
            "}",
            this.entryPointInChildren(chunk) ? [
              "if(executeModules) {",
              this.indent([
                "for(i=0; i < executeModules.length; i++) {",
                this.indent(`result = ${this.requireFn}(${this.requireFn}.s = executeModules[i]);`),
                "}"
              ]),
              "}",
              "return result;",
            ] : ""
          ]),
          "};"
        ]);
      }
      return source;
    });
    mainTemplate.plugin("hot-bootstrap", function(source, chunk, hash) {
      const hotUpdateChunkFilename = this.outputOptions.hotUpdateChunkFilename;
      const hotUpdateMainFilename = this.outputOptions.hotUpdateMainFilename;
      const hotUpdateFunction = this.outputOptions.hotUpdateFunction;
      const currentHotUpdateChunkFilename = this.applyPluginsWaterfall("asset-path", JSON.stringify(hotUpdateChunkFilename), {
        hash: `" + ${this.renderCurrentHashCode(hash)} + "`,
        hashWithLength: length => `" + ${this.renderCurrentHashCode(hash, length)} + "`,
        chunk: {
          id: "\" + chunkId + \""
        }
      });
      const currentHotUpdateMainFilename = this.applyPluginsWaterfall("asset-path", JSON.stringify(hotUpdateMainFilename), {
        hash: `" + ${this.renderCurrentHashCode(hash)} + "`,
        hashWithLength: length => `" + ${this.renderCurrentHashCode(hash, length)} + "`
      });
      const runtimeSource = Template.getFunctionContent(require("./JsonpMainTemplate.runtime.js"))
        .replace(/\/\/\$semicolon/g, ";")
        .replace(/\$require\$/g, this.requireFn)
        .replace(/\$hotMainFilename\$/g, currentHotUpdateMainFilename)
        .replace(/\$hotChunkFilename\$/g, currentHotUpdateChunkFilename)
        .replace(/\$hash\$/g, JSON.stringify(hash));
      return `${source}
function hotDisposeChunk(chunkId) {
  delete installedChunks[chunkId];
}
var parentHotUpdateCallback = global.parentHotUpdateCallback = this[${JSON.stringify(hotUpdateFunction)}];
this[${JSON.stringify(hotUpdateFunction)}] = ${runtimeSource}`;
    });
    mainTemplate.plugin("hash", function(hash) {
      hash.update("jsonp");
      hash.update("4");
      hash.update(`${this.outputOptions.filename}`);
      hash.update(`${this.outputOptions.chunkFilename}`);
      hash.update(`${this.outputOptions.jsonpFunction}`);
      hash.update(`${this.outputOptions.hotUpdateFunction}`);
    });
  }
}
module.exports = JsonpMainTemplatePlugin;